The component layer · parts · FAA feed as of October 13, 2026

Parts

Two public FAA records meet here. The failure reports that airlines and repair shops file say which part failed, on what aircraft, and how (worn, cracked, leaking); the words they use are brought to one plain name, so "BRAKE ASSY", "Brake Assembly" and "brake" are one part. The parts manufacturer approvals say which companies may make a replacement part of that name for which models. 1,227,278 approvals held by 3,185 companies, 1,227,228 of them current. Click a part for its page; a part makers list is beside it.

Approved replacement parts by system 1,227,278 approvals

Approved parts by system, as a table

	approvals
Other and general	843,094
Cabin, seats and restraints	184,224
Airframe structure	55,196
Engine	44,658
Electrical power	40,411
Instruments and avionics	14,631
Flight controls	13,152
Landing gear	10,784
Heating, ice protection and utility systems	7,627
Emergency equipment	5,492
Propeller	2,667
Fuel system	2,663
Rotorcraft systems	2,061
Electric propulsion	618

Approvals granted by year

Approvals by year, as a table

	approvals
1990	1,112
1991	4,260
1992	11,202
1993	8,753
1994	8,945
1995	11,371
1996	10,536
1997	18,003
1998	20,081
1999	18,991
2000	21,483
2001	30,752
2002	14,589
2003	37,407
2004	24,859
2005	76,711
2006	48,067
2007	36,034
2008	37,630
2009	57,789
2010	48,738
2011	63,745
2012	74,881
2013	64,140
2014	45,366
2015	100,038
2016	50,349
2017	24,220
2018	36,125
2019	36,555
2020	23,146
2021	28,183
2022	27,634
2023	19,441
2024	14,062
2025	54,071
2026	11,539

Models with the most approved replacement parts

Boeing 737 170,491 Boeing 777 150,018 Boeing 747 139,984 Boeing 767 94,577 Boeing 757 79,216 Airbus A330 57,903 Airbus A320 36,556 Airbus A340 34,582 Airbus A321 31,770 Boeing 727 30,081 Boeing 787 Dreamliner 29,394 Airbus A319 27,080 Airbus A300 24,786 Bombardier CL-600 Challenger and CRJ 21,226 Mcdonnell Douglas DC-9 15,421

Part	Mostly in	Reports, 10 years	Reports since 1995	Approved replacements	Makers
Fuel Divider	Engine	2	14
Uplock Box	Landing gear	2	14
Breaker Points	Engine	2	13
Collective Stick	Rotorcraft systems	2	13	6	4
Lock Sensor	Landing gear	2	13
Modulator	Heating, ice protection and utility systems	2	13	12	7
Blkhd Frame	Airframe structure	2	12
Centering Mech	Flight controls	2	12	2	1
Scavenge Tube	Engine	2	12
Fuel Strainer	Engine	2	11	14	7
Mount Flange	Airframe structure	2	11
Sticker	Other and general	2	11	2	2
Tuning Unit	Instruments and avionics	2	11
Actuator Cable	Engine	2	10
Control Horn	Flight controls	2	10
Hour Meter	Engine	2	10	7	3
Intake Pipe	Engine	2	10	7	2
Spring Strut	Landing gear	2	10	4	3
Water Line	Cabin, seats and restraints	2	10	13	2
Bellmouth	Engine	2	9	2	1
Fillercap	Engine	2	9
Humidifier	Heating, ice protection and utility systems	2	9	4	1
Ics Box	Instruments and avionics	2	9
Lockout	Engine	2	9
Cowl Latch	Airframe structure	2	8	2	2
Interrogator	Instruments and avionics	2	8
Sight Tube	Electrical power	2	8
Tail Wheel	Landing gear	2	8	149	15
Tub	Fuel system	2	8	1	1
Unlock Cylinder	Landing gear	2	8
Acquisition Unit	Instruments and avionics	2	7
Brake Fuse	Landing gear	2	7	1	1
Control Circuit	Electrical power	2	7
Ctc	Heating, ice protection and utility systems	2	7
Drive Coupling	Electrical power	2	7	16	5
Efb	Cabin, seats and restraints	2	7
Keyway	Engine	2	7
Override Switch	Fuel system	2	7
Sprag	Rotorcraft systems	2	7
Adf	Instruments and avionics	2	6	2	1
Bleed Actuator	Engine	2	6	2	1
Catwalk	Airframe structure	2	6
Control Knob	Instruments and avionics	2	6	5	3
Exhaust Rocker	Engine	2	6	2	1
Friction Cup	Rotorcraft systems	2	6
Galley Mat	Cabin, seats and restraints	2	6	2	1
Mirror	Cabin, seats and restraints	2	6	124	13
Phone	Airframe structure	2	6	80	3
Remote Switch	Cabin, seats and restraints	2	6	5	4
Rivnut	Cabin, seats and restraints	2	6
Smoke Hood	Cabin, seats and restraints	2	6	1	1
Stick Pusher	Instruments and avionics	2	6	7	6
Console	Airframe structure	2	5	104	16
Data Box	Instruments and avionics	2	5
Exhaust Port	Engine	2	5	3	3
Follower	Flight controls	2	5	44	10
Hand Pump	Landing gear	2	5	15	7
Master Link	Flight controls	2	5
Pointer	Instruments and avionics	2	5	4	3
Uniball	Engine	2	5	3	1
Adhesive	Cabin, seats and restraints	2	4	8	3
Bull Gear	Engine	2	4
Call Chime	Instruments and avionics	2	4
Control Chain	Flight controls	2	4
Coupling Sleeve	Electrical power	2	4	18	8
Downlock Arm	Landing gear	2	4
Filter Module	Heating, ice protection and utility systems	2	4	62	6
Flapper Bearing	Heating, ice protection and utility systems	2	4
Fscu	Flight controls	2	4	1	1
Ifs	Engine	2	4
Lock Bar	Airframe structure	2	4
Manual	Cabin, seats and restraints	2	4	1	1
Ovrspeed Limiter	Engine	2	4
Slide Channel	Airframe structure	2	4
Temp Strip	Emergency equipment	2	4
Aims	Instruments and avionics	2	3
Battery Beacon	Electrical power	2	3
Bearing Shaft	Landing gear	2	3	4	4
Bonding Cable	Airframe structure	2	3	2	1
Bushing Sleeve	Engine	2	3	86	20
Closet	Cabin, seats and restraints	2	3	337	33
Compound	Airframe structure	2	3	24	4
Emer Power	Electrical power	2	3
Flow Multiplier	Heating, ice protection and utility systems	2	3
Fuel Rail	Engine	2	3
Guide Block	Airframe structure	2	3	8	4
Hoist	Cabin, seats and restraints	2	3	25	5
Master Relay	Electrical power	2	3
Servicing Valve	Cabin, seats and restraints	2	3
Spade Door	Airframe structure	2	3
Starter Unit	Engine	2	3
Thermal Bypass	Engine	2	3	4	2
Vsv	Engine	2	3
Afd	Instruments and avionics	2	2
Airbag	Cabin, seats and restraints	2	2
Avranging Unit	Emergency equipment	2	2
Axe	Cabin, seats and restraints	2	2	1	1
Back Light	Flight controls	2	2
Backlight	Instruments and avionics	2	2
Ballnut	Flight controls	2	2

Sources: the FAA's service difficulty reports (1995 to date; the part name as the reporter wrote it, reduced to its first plain words) and the FAA's parts manufacturer approvals from the Dynamic Regulatory System. A report counts a part that failed and was fixed; it does not say how many of that part are flying, so a common part on a big fleet is reported more. "Unknown" and blank names are left out.